Discharge-valve for blowing-engines



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T. JAMES. DISCHARGE VALVE EOE BLOWING ENGINES.

No. 490,146. Patented Jan. 17, 1893..

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T. JAMES. DISCHARGE VALVE EUR BLOWING ENGINES. v No.' 490,146. Patented Jan. 17, 1893.

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UNITED STATES PATENT OFFICE.

THOMAS JAMES, or BRADDooK, AssIcNoa To THE soUTHwARK roUNDnY ALTDMA'CHINE COMPANY, OF PHILADELPHIA, PENNSYLVANIA.

srnc'rrrcs'rron'femmg of Letters lPatent No. 490,146, dated January 17, 189e.

' i Application led August 22,1891. Serial lic-"103.38'7.- (No model.)

do`ck,in .the county of Allegheny and Stateof Pennsylvania, have invented a' new and use ful Improvement in Discharge ,-Valves ,for

.Blowing-Engines, ci'V which th'e'following is a full,- clear, and exact description, reference ben Figure 1 is a vertical section of a blowing`l cylinder providedwith my improved valve; Figi is a similar view, showing ythe discharge valve in another position." Fig. -3 is a detail sectional view of the automatic valve; i Fig. 4" is-a'cross-section of Eigg, onthe yline IVe-IV;v

'and Fig-ois asimilar viewwitli-'the parts in Va differentpositionif of blowing cnginesyarndi'sj designed to produceanautomaticvalvewhichinstantlyopens when the pressure v in'the cylinder exceeds fa determined pressure, and closes. againv when the pressure .in thecylinder falls belowfsuch.

' reservoir. This action continues until the" pressure.

and 3 thepiston'f'reciproeating thereim In the upper end of 'thefc'ylinderl is provided a series of exit' ports erover which slides the dischargefvalve 5 havingacorresponding series of 'ports' therein.' This-valve 5 moves inside of the blast-'receiver 6 vlt'o which the endicfthe" cylinder is; secured.- v `The yvalve-stein? is adjustabl'y connected with the discharge-valve by the threaded portion 8 and locking nuts 9,

. 11, a smallpipe 16, previdedwithgapet cock y and 21, the disk 20 having a valve-seat there-Ay 317, being inserted in the innenend of the cyllindern. Upon the valve-stem 1'8 is arranged an automatic valve, consisting of two disks 2O s on and being splined'upon-a longitudinal rib y 22' in the casing, whilethe'disk 21 is splinedupon the -stem as shown at 23. The two disks are provided with a' series of registering open-L l the drawingsff ftlieengine Grnden.

ings 24, which, by turning the shaft or stem 18 may be changed in their relation to each other, since the disk 20 is held from tuin lng by the spline upon the' interior of the easing. Thus, when theair passes from the blowingcylinder lto the cylinder 11, the valve is forced back,both disks sliding freely upon the stem, thus allowing free passage of. the air and caus- Y ing the valve 5 to open instantly; but when the air is exhausted from the cylinder 11 into theblowing engine, the valve is drawn against its seat and the air passes only through the jholes, the sizeofsuch holesy being regulated by turning the stem 18 by its handle 19thus.

lrotating the-disk 21.

The action .isas follows: The parts being in the position shown in Fig. 1, with the piston "rising, when; pressure of the ainwhlch '1s being compressed' above the piston. exceeds thep'ressu-re ofthe steam in 'the cylinder 10,

- such pressure'by the branch-'pi pe v15 instantlyv actuate's thepston 13 andopens the valve 5,

allowing the compressed air to enter the blast piston reaches the upper end of itsv stroke, when the pipe'15 is uncovered, the pipe en- -tering'the cylinder below the end a distance slightly greater than the thickness of the pis ton, and the compressed air within the cylininderll is exhausted into the cylinder 2, thereby'allowingthe steam pressure in the pipe 14:'

to again close the valve 5,which remains closed until the piston again reaches thepoint uponits upstroke,`at which the pressure above the piston exceeds the steam pressure `in the pipe 14, when the valve again opens. By adjust# jing the'cock 17, 'the proper size of exit is obxtained for supplying a cushioningor dash pot action to the cylinder 11, while -upon the back 'stroke of the piston 10 the steam is compressed 'within the' pipe 14. v s 'It is vevident that by changing the relative sizes of the pistons 12 and 13, the point at lwhich the valve will open can be nicely reguated.

Many other. changes inthe shape and avr-A" rangement ofthe parts maybe made without departure from my invention, which I regard' as'lying'ibroadly in the automatic valve hav' Aing a. rod provided with two pistons, one actuatedby a. constant pressure from an inde- ICO ed with said valve, a branch connection from` the cylinder arranged to actuate one piston,

and a branch connection communicating with an independent source ef constant pressure arranged to actuate the other piston substantially as and for-'the purposes described.l

2. A blowing-cylinder having a discharge-` valve, the stem of which valve extends through two cylinders, a piston secured' to the valvestem in each cylinder, a branch connection leading froman independent source of constant pressurefto one cylinder,fand a branch pipeleading from the blowing cylinder to -the other cylinderg'substantially as and for the purposes described.

3. The combination'with 'a blowing-cylinder and its discharge-valve, of two pistons secured tothe valve-rod, two cylinders within Awhich said pistons operate, abranch connection leading from an independent source of constant pressure t0 one cylinderfa branch pipe ylead-A ing from the blowing-cylinder to one end of the second cylinder, and an'open-ended valve controlled pipe connected to the other end of said second cylinder; substantially asa'n'd for the purposes described. l

4. The combination -with a blowing-,cylinder and its dischargeivalve, of two pistons secured to the valve rod, two cylinders lwithin which Said pistons operate, abranch connection lead- 'ing from an independent source of constant der, and a. branch pipeleading from the blowing-cylinder to the .other cylinder; substantially as and for the purposes described.

(i`- A blowing-cylinder,-having a dischargevalve, two pistons'secured to the valve-stein,

cylinders within which such pistons operate, a supply-pipe leading -from a source of' constent pressure` to one of said "cylinders, 'a branch pipe connecting the blowing cylinder with the other of said cylinders, and an automatic check-valve in said branch pipe; substantiallyeas and for the purposes described. In testimony Whereol I'have hereunto sel my hand this 19th day of August, A. D. 1891.

v .THOMAS JAMES.' kVlitnessez 1 I DAVID S. MCCANN, j H.jM..CoRW1N. 

